Apparatus for setting saws.



lJ'NiTED sTATns PATENT OFFICE.

JOHN .T. DUANE AND RUSSELL H. MoFARLAND, OF DALTON, GEORGIA.

APPARATUS FOR SETTING sAws.

Specification of Letters Patent.

Patented July 23, 1907.

Application filed April 19 1907. Serial No. 369,134.

To all whom it may concern:

Be it known that we, JOHN J. DUANE and RUSSELL H. MCFARLAND, citizens of the United States, residing at Dalton, in the county of Whitfield and State of Georgia, have invented certain new and useful Improvements in Apparatus for Setting Saws; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in apparatus for setting saws, and the object of the invention is to produce a simple and efiicient mechanism of this nature whereby every tooth may receive a uniform blow, insuring an even set, and not necessitating the use of a hand gage for testing the set, thereby resulting in a saving of time and affording means whereby the saw may be kept in better shape and effecting a setting which will save valuable timber being cut away in the use of the saw.

The invention consists in various details of const uetion and combinations and arrangements of parts which will be hereinafter fully described and then specifically defined in the appended claims.

Our invention is illustrated in the accompanying drawings, in which:

, Figure 1 is a perspective view of our apparatus. Fig. 2 is a detail sectional view, and Fig. 3 is a detail view of an attachment for use when band saws are be ing set.

Reference now being had to the details of the drawings by numerals, 1 designates a board to which the apparatus is secured by means of bolts 2 which pass through tubing or pipes 2.

3 designates an angled plate forming the support for the setting apparatus and which is held by means of the bolts in the manner shown clearly in Fig. 1 of the drawings. Said angled frame or plate has two elongated slots 3 and 3 formed therein, the former of which is adapted to receive the set hammer 10 which is made of tool steel having its upper portion 11 bent at right angles and apertured to receive an eye-bolt 11. Suitable guide plates 26 are fastened by means of bolts 26, spaced apart from the plate 3, suitable washers or pipes being interposed between said plates 26 and the upright portion of the plate or frame 3. Said plates 26 are adapted to prevent the set hammer from passing through the slot 3, and the washers or pipes through which the bolts 26 pass serve also to guide the hammer against a lateral movement as it moves vertically. Mounted directly underneath said hammer and in a slot of the upright of the plate 3 is an anvil block 27 which is held in place by the plates 27 which are bolted to the plate or frame 3 in the manner shown clearly in the drawings.

Fixed to the rear of the upright portion of the plate 3 are the angled plates 8 and 9 which are apertured to receive the trigger bar 4 having a vertical play therein, the lower end of said trigger bar being pivotally connected at 33 to the tread 30. An eye-bolt 32 passes through said foot lover or tread and a rod 29 connects said eye-bolt with a screw 28 which is fastened to the laterally projecting portion of the plate 3, and affords means whereby the foot lever 30 may be fulcrumed. 31 is a spring fastened at its lower end 31 to said board and at its upper end to the trigger bar and which serves to normally hold the latter at its lowest position.

5 designates a trigger which is pivotally mounted upon the trigger bar, and 6 designates a spring fastened at one end to said trigger and its other end to the rod 4 and which serves to throw said trigger in the path of the angled end 11 of the set hammer.

l2 designates a coiled spring which is fastened at its upper end to the eye-bolt 11 and its other end is fastened to a chain 13 which passes through a slot 9 having a contracted offset portion in which the links of the chain may be caught for the purpose of regulating the tension of said spring 12.

Mounted upon the lateral extension of the plate or frame 3 is a saw rest base 14 having an extension upon the lower edge thereof which is guided in said slot 3. Said base 14 has a central aperture therein to receive the stud or bolt 17 having a winged nut 17 thereon, and at the upper end of said stud or bolt is a disk 15 having apertures therein to receive the thumb-screws 16 for adjusting the swinging angled block 18 which is pivotally mounted at 19 upon ears of said disk. Said angled block has a conical outlined countersunken opening in the top thereof and also countersunken holes in the bottom for said screws 16, and 20 designates a stud bolt mounted in the swinging angled block and which is provided with a cone 22 which extends into the conical-shaped opening or countersink in the upper surface of the block 18, whereby saws having different sized eyes or openings therein may be centered. A suitable thumb-screw 23 is mounted upon the upper end of the stud bolt 20, whereby said cone 22 may be held in the eye of a saw. A suitable washer 24 is mounted upon the stud bolt 20 and is adapted to bear between the thumb nut 23 and said cone.

Mounted upon the rear face of the upright portion of the frame or plate 3 is a trip plate 7 which is held a the set, by the adjustment of the screw 16.

trigger 6 will be thrown out of engagement with the angled end of the set hammer, allowing the same to fall by gravity, supplemented by the action of the spring 12 which will cause said hammer to be thrown forcibly down upon the anvil block 27 upon which the teeth of the saw are adapted to rest.

In Fig. 3 of the drawings, we have shown an angled block for use with band saws which is adapted to swing between said screws in the same manner as the block 18 utilized with ordinary circular saws. In said modification, an offset is formed in the top of the block 35 and also in the bottom of the block 36, the latter carrying a suitable threaded stud 37 provided with a thumb nut 38, thus allowing a slight friction sutficient to hold the saw securely in place.

In setting a circular saw, the same is placed upon the swinging angled block 18, the cone 22 being adjusted in the eye or aperture of the saw and the thumb nut 23 tightened to securely hold the saw upon said block. This being done, said block may be adjusted at the proper angle at which it may be desired to form The teeth resting upon the anvil block, the apparatus is in readiness to be operated. The operator by depressing the foot lever, will cause the trip rod to be raised, the trigger raising the set hammer therewith. As the hammer is raised, the spring 12 will be placed under tension and whenthe trigger comes in contact with the trip plate 7, said trigger will be released from the angled portion of the hammer and the latter will be allowed to fall, its downward movement being accelerated by the coiled spring connected thereto, thus dealing a uniform and heavy stroke upon the tooth of a saw.

By the utilization of an apparatus embodying our invention, it will be noted that each tooth will get a uniform blow, insuring an even set without the use of a hand gage to determine the set of each tooth, thereby effecting a saving in time and keeping the saw in proper shape. Our apparatus, owing to its simplicity of construction, may be operated by an inexperienced hand, as it will be impossible to impart light or glancing blows and is designed for fine tooth, trimming and cut off saws, as well as coarse tooth rip saws.

It will also be noted that our apparatus may be used for setting band saws, and the parts being accessible, may be readily adjusted for such use, the parts being adjustable for any size of circular or band saws, with four points to the inch or less, and being actuated by foot power, the hands of the operator will both be free for managing the saw, and the apparatus may be readily adjusted for any set desired.

What we claim is In a saw setting apparatus, the combination of a frame having an elongated vertical slot, a set hammer provided with a lateral extension having a longitudinal play in said slot, a fixed anvil positioned in the path of the hammer, guiding means for guiding said hammer, a vertically movable bar, a trigger carried thereby and adapted to contact with the lateral projection of said hammer as the bar is raised, and means arranged to be rendered eifective by the upward movement of the bar for releasing said trigger, as set forth.

In testimony whereof we hereunto atfix our signatures in the presence of two witnesses.

JOHN J. DUANE. RUSSELL H. MCFARLAND.

Witnesses:

DAISY FINLEY, J. 1. LONG. 

